Lock-nut.



E. R. HIBBARD.

LOCK NUT.

APPLICATION FILED 0120.5, 1914.

Patented May 14, 1918.

UNITED STATES PATENT OFFICE- EDWARD B. HRIBABID, 01? OAK PARK, ILLINOIS, ASSIG-NOIB. T0 GRIP COMPANY, 01 CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOCK-NUT.

Specification of Letters Patent.

Patented ay 14, IQIS.

Application filed December 5, 1914. Serial No. 875,611.

To all whom it may concern.

Be it known that I, EDWARD R. HIBBARD, a citizen of the United States of America, residing at Oak Park, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lock-Nuts, of which the following is a description.

My invention belongs to that general class of devices known as grip nuts, which are so constructed that while they may be readily threaded upon a cooperating bolt, the turning of the nut down upon the bolt causes the two to so bind or gri one another as to prevent the accidental isengagement of the nut caused by vibration when in use.

My invention consists in the novel con struction, and the process of producing the same, herein shown and described, and more particularl pointed out in the claim.

In the awings, wherein like reference characters indicate like or corresponding P Figure 1 is a top plan view of my improvement;

Fig. 2 is an edge view, partly broken away to more clearly show the construction;

Fig. 3 is a plan view of the barof metal from which the nut blanks may be cut;

Fig. 4 is a lan view of a slightly modified form, em odying the same features of novelty.

In the drawings, 1 represents a bolt nut, which on one face as at 2 is normal in every respect, the bolt hole being substantially a true circle in the usual manner, that is, the threaded part is substantially circular to engage the bolt. The other face of the nut is provided with at least one, and preferably two, substantially parallel grooves 3-3, one of which is positioned on each side of the bolt hole between the margin of the blank and the hole.

I After the nut is properly threaded, a suitable tool engaging the walls of the grooves on either side, slightly compresses the same,

.. causing the metal to yield in the line of least resistance and causing the bolt hole to assume a slightly oval form, as indicated. As shown in Fig. 1, 4.4 ma indicate the normal wall of the bolt ho e, while 55 will indicate the abnormal. By this process the diameter of the hole across the grooves is the diameter of the bolt hole is reduced,

as stated, and thence bind upon the bolt, causing a tight fit, and so gripping the bolt that it may not beaccidentally disen aged.

As stated, one groove may be clent v to secure satisfactory results, although in practice I have found it more desirable to emplo two, as indicated. If it is desired the threaded nuts may be first passed throu h a heating oven to render them more worka 1e and requiring less power to distort them, as stated.

Fig. 4: is a plan view of a modification in which the face of the nut is also provided with grooves 66 transverse to the grooves 3-3. The walls of the nut may thus be compressed in two directions, distorting the bolt hole, which tends to approach a square, and causing the nut to bind on the bolt at that point.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

A. lock nut, comprising a blank having substantially parallel faces transverse to the bolt hole with the usual screw-threaded bolt hole formed therein, one face of the nut having substantially parallel grooves the full width, of the nut arranged one on each side .Witraesseszw orm HILL, C I. COBB. 

